gptkb:Apostles_parade
concert hall
automata
astrolabe
display of equinoxes and solstices
display of positions of the sun and moon
display of solar and lunar eclipses
mechanical calendar
gptkb:ecclesiastical_calendar gptkb:time_zone
solar time
leap years
planetary positions
equinoxes
lunar time
movements of the moon
movements of the sun
phases of the moon
solstices
zodiac signs